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Microfluidic fabrication of hollow microcapsule through the metal-phenolic interaction
최관현,이준혁,유필진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this work, we combine these two techniques: the microfluidics and metal-phenolic chemistry, as promising tools for designing versatile hollow functional microcapsule. By taking advantages of both techniques, it is available to fabricate multiple functional capsules with spatially controlled position by simply utilizing Liq.-Liq. interfacial reaction of metal-phenolic chemistry. It is expected that this approach makes a major contribution to research on the role of the spatially sequential combination of various functional capsules.
최관현,유필진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Researchers have been trying to functionalize polymer-based 3-D inverse opal structures to utilize their unique 3-D geometric properties for various applications including optics, separation and piezoelectric devices. However, functionalization is still challenging due to the limited diffusion of water-based precursor solutions into the intrinsically hydrophobic 3-D inverse opal nanostructures. In this study, we demonstrated a simple polydopamine (PD) and silver nitrate dip-coating method for functionalizing polymeric 3-D inverse opal structures for use as catalytic membranes. This facile PD coating not only improves the hydrophilicity of the inverse opal structure for the infiltration of precursor solution (i.e. silver), but also provides nucleation sites for the reduction of silver nanoparticles. Finally, these PD-silver nanoparticle decorated 3D-inverse opal films are applied as catalytic membranes for the reduction of 4-nitrophenol to its amino derivatives in the presence of NaBH4. Combining silver nanoparticles with materials with large specific area such as 3-D inverse opals, yields remarkable catalytic membrane performance, simultaneously indicating a high flux and high conversions under proper conditions.
남명균,최관현,유필진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Among various coating strategies, metal phenolic networks (MPN) has gathered prominent attention owing to a wide variety of new functionalities to various substrates through its simple mixing process. However, MPN have critical drawbacks in the aspect that its MPN network is destroyed during thermal reduction process due to its own thermal decomposition property, and thus it cannot provide electrical characteristics with the surface of target substrates. Herein, to overcome these hurdles for imparting electrical properties, we have developed carbonizable MPN film through polymerization of MPN. Above all, we provide the milestone for applying MPN system to various kinds of energy-related researches via identifying its polymerization mechanism. From the point of view, we attempt MPN to apply to silicon for anode of lithium ion battery, as a result, we could successfully synthesize carbon-metal hybrid shell on silicon nanoparticles for highly capacitive/stable anode materials.
Competitive concurrence of surface dewetting and wrinkling of liquid crystalline network films
송성은,최관현,유필진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this study, we propose polymeric thin films of liquid crystalline (LC) mesogens prepared on a non-wettable Si substrate and apply a treatment of plasma irradiation to form a thin polymerized layer at the surface. The resulting compressive stress generated in the surface region drives the formation of wrinkles, while at the same time, dipolar attraction between LC molecules induces competitive cohesive dewetting. Intriguing surface structures were obtained whereby dewettinglike hole arrays are nested inside the randomly propagated wrinkles. The structural features are readily controlled by the degree of surface cross-linking, hydrophilicity of the substrates, and the LC film thickness.